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Goodwill and intangible assets - Goodwill Activity (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 15, 2020 | Feb. 14, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill |  |  |  |
Beginning Balance |  |  | $ 169,051 | $ 137,190
Addition from acquisitions |  |  |  | 31,961
Relief of goodwill due to sale of TPO mortgage delivery channel |  |  |  | (100)
Ending Balance |  |  | 242,561 | $ 169,051
Farmers National |  |  |  |
Goodwill |  |  |  |
Addition from acquisitions |  | $ 6,319 | 6,319 |
Franklin |  |  |  |
Goodwill |  |  |  |
Addition from acquisitions | $ 67,191 |  | $ 67,191 |

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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- Definition Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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